最近想試驗(yàn)下STC15F2K08A2的捕獲功能，自用它測(cè)試一下脈沖的市電平持續(xù)時(shí)間�？碨TC15手冊(cè)時(shí)有幾個(gè)問題沒看明白，請(qǐng)大神指點(diǎn)下。
當(dāng)CCP_S0=0 CCP_S1=0時(shí)，脈沖應(yīng)該從哪個(gè)腳輸入，是P1.2嗎，如果是，那么P1.0和P1.1腳用作什么，可能當(dāng)普通I/O用嗎？
下面的程序是從STC－ISP中直接粘貼過來的，我用試驗(yàn)板試了下，沒有反應(yīng)。
請(qǐng)用用過的大神指點(diǎn)下STC和捕獲功能具體用法 ，謝謝。
/*---------------------------------------------------------------------*/ /* --- STC MCU Limited------------------------------------------------*/ /* --- STC15F4K60S4 系列 PCA實(shí)現(xiàn)16位捕獲舉例---------------------------*/
/* 如果要在程序中使用此代碼,請(qǐng)?jiān)诔绦蛑凶⒚魇褂昧?/font>STC的資料及程序 */ /* 如果要在文章中應(yīng)用此代碼,請(qǐng)?jiān)谖恼轮凶⒚魇褂昧?/font>STC的資料及程序 */ /*---------------------------------------------------------------------*/
//本示例在Keil開發(fā)環(huán)境下請(qǐng)選擇Intel的8058芯片型號(hào)進(jìn)行編譯 //若無特別說明,工作頻率一般為11.0592MHz
#include "reg51.h" #include "intrins.h"
#define FOSC 11059200L
typedef unsigned char BYTE; typedef unsigned int WORD; typedef unsigned long DWORD;
sfr P0M1 = 0x93; sfr P0M0 = 0x94; sfr P1M1 = 0x91; sfr P1M0 = 0x92; sfr P2M1 = 0x95; sfr P2M0 = 0x96; sfr P3M1 = 0xb1; sfr P3M0 = 0xb2; sfr P4M1 = 0xb3; sfr P4M0 = 0xb4; sfr P5M1 = 0xC9; sfr P5M0 = 0xCA; sfr P6M1 = 0xCB; sfr P6M0 = 0xCC; sfr P7M1 = 0xE1; sfr P7M0 = 0xE2;
sfr P_SW1 = 0xA2; //外設(shè)功能切換寄存器1
#define CCP_S0 0x10 //P_SW1.4 #define CCP_S1 0x20 //P_SW1.5
sfr CCON = 0xD8; //PCA控制寄存器 sbit CCF0 = CCON^0; //PCA模塊0中斷標(biāo)志 sbit CCF1 = CCON^1; //PCA模塊1中斷標(biāo)志 sbit CR = CCON^6; //PCA定時(shí)器運(yùn)行控制位 sbit CF = CCON^7; //PCA定時(shí)器溢出標(biāo)志 sfr CMOD = 0xD9; //PCA模式寄存器 sfr CL = 0xE9; //PCA定時(shí)器低字節(jié) sfr CH = 0xF9; //PCA定時(shí)器高字節(jié) sfr CCAPM0 = 0xDA; //PCA模塊0模式寄存器 sfr CCAP0L = 0xEA; //PCA模塊0捕獲寄存器 LOW sfr CCAP0H = 0xFA; //PCA模塊0捕獲寄存器 HIGH sfr CCAPM1 = 0xDB; //PCA模塊1模式寄存器 sfr CCAP1L = 0xEB; //PCA模塊1捕獲寄存器 LOW sfr CCAP1H = 0xFB; //PCA模塊1捕獲寄存器 HIGH sfr CCAPM2 = 0xDC; //PCA模塊2模式寄存器 sfr CCAP2L = 0xEC; //PCA模塊2捕獲寄存器 LOW sfr CCAP2H = 0xFC; //PCA模塊2捕獲寄存器 HIGH sfr PCA_PWM0 = 0xf2; //PCA模塊0的PWM寄存器 sfr PCA_PWM1 = 0xf3; //PCA模塊1的PWM寄存器 sfr PCA_PWM2 = 0xf4; //PCA模塊2的PWM寄存器
BYTE cnt; //存儲(chǔ)PCA計(jì)時(shí)溢出次數(shù) DWORD count0; //記錄上一次的捕獲值 DWORD count1; //記錄本次的捕獲值 DWORD length; //存儲(chǔ)信號(hào)的時(shí)間長(zhǎng)度(count1 - count0)
void main() { P0M0 = 0x00; P0M1 = 0x00; P1M0 = 0x00; P1M1 = 0x00; P2M0 = 0x00; P2M1 = 0x00; P3M0 = 0x00; P3M1 = 0x00; P4M0 = 0x00; P4M1 = 0x00; P5M0 = 0x00; P5M1 = 0x00; P6M0 = 0x00; P6M1 = 0x00; P7M0 = 0x00; P7M1 = 0x00;
ACC = P_SW1; ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=0 CCP_S1=0 P_SW1 = ACC; //(P1.2/ECI, P1.1/CCP0, P1.0/CCP1, P3.7/CCP2)
// ACC = P_SW1; // ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=1 CCP_S1=0 // ACC |= CCP_S0; //(P3.4/ECI_2, P3.5/CCP0_2, P3.6/CCP1_2, P3.7/CCP2_2) // P_SW1 = ACC; // // ACC = P_SW1; // ACC &= ~(CCP_S0 | CCP_S1); //CCP_S0=0 CCP_S1=1 // ACC|= CCP_S1; //(P2.4/ECI_3, P2.5/CCP0_3, P2.6/CCP1_3, P2.7/CCP2_3) // P_SW1 = ACC;
CCON = 0; //初始化PCA控制寄存器 //PCA定時(shí)器停止 //清除CF標(biāo)志 //清除模塊中斷標(biāo)志 CL = 0; //復(fù)位PCA寄存器 CH = 0; CCAP0L = 0; CCAP0H = 0; CMOD = 0x09; //設(shè)置PCA時(shí)鐘源為系統(tǒng)時(shí)鐘,且使能PCA計(jì)時(shí)溢出中斷 CCAPM0 = 0x21; //PCA模塊0為16位捕獲模式(上升沿捕獲,可測(cè)從高電平開始的整個(gè)周期),且產(chǎn)生捕獲中斷 // CCAPM0 = 0x11; //PCA模塊0為16位捕獲模式(下降沿捕獲,可測(cè)從低電平開始的整個(gè)周期),且產(chǎn)生捕獲中斷 // CCAPM0 = 0x31; //PCA模塊0為16位捕獲模式(上升沿/下降沿捕獲,可測(cè)高電平或者低電平寬度),且產(chǎn)生捕獲中斷
CR = 1; //PCA定時(shí)器開始工作 EA = 1;
cnt= 0; count0 = 0; count1 = 0;
while (1); }
void PCA_isr() interrupt 7 { if (CCF0) { CCF0 = 0; if (CF && ((CCAP0H & 0x80) == 0)) { CF = 0; cnt++; } count0 = count1; //備份上一次的捕獲值 ((BYTE *)&count1)[3] = CCAP0L; //保存本次的捕獲值 ((BYTE *)&count1)[2] = CCAP0H; ((BYTE *)&count1)[1] = cnt; ((BYTE *)&count1)[0] = 0; length = count1 - count0; //計(jì)算兩次捕獲的差值,即得到時(shí)間長(zhǎng)度 ((BYTE *)&length)[0] = 0; } if (CF) { CF = 0; cnt++; //PCA計(jì)時(shí)溢出次數(shù)+1 } }
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